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Virtual work is a powerful method used to solve problems involving several connected rigid bodies. When the system is in equilibrium, virtual work is zero. This allows the calculation of the resulting forces when a system undergoes a virtual displacement. When attempting to analyze such a system, first, use a free-body diagram, where an independent coordinate represents the configuration of the links, and mark its deflected position resulting from the positive virtual displacement.
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When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
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相关实验视频

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Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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一个增强的脊柱模型被验证用于模拟OpenSim中的动态提升任务.

Mohammadhossein Akhavanfar1, Alexandre Mir-Orefice1, Thomas K Uchida2,3

  • 1School of Human Kinetics, Faculty of Health Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada.

Annals of biomedical engineering
|September 23, 2023
PubMed
概括
此摘要是机器生成的。

这项研究对动态任务增强了胸脊柱模型,准确预测了举重过程中的脊柱力. 经过验证的模型被推用于脊柱负荷的生物力学分析.

关键词:
动态任务动态任务脊椎间的负荷 脊椎间的负荷起重 起重 起重 起重 起重降低 降低 降低多体是指多体体.肌肉骨模型的模型脊柱力是指脊柱的力量.脊柱 脊柱 脊柱 脊柱 脊柱验证 验证 验证 验证脊椎植入物是一种植入物.

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科学领域:

  • 生物力学 生物力学
  • 肌肉骨系统建模
  • 脊柱健康 脊柱健康

背景情况:

  • 一个经过验证的OpenSim胸脊柱模型存在于静态任务.
  • 需要改进,以模拟起重等动态活动.
  • 对于动态模拟,被动结构和动力学约束被纳入.

研究的目的:

  • 为了增强现有的OpenSim胸脊柱模型,用于动态任务.
  • 为了验证增强模型在动态提升过程中对脊柱力量的估计.
  • 为了比较不同的外部负载建模方法的准确性.

主要方法:

  • 改进了之前开发的OpenSim胸脊柱模型.
  • 集成的被动结构和动态模拟的动态约束.
  • 验证了模型与来自九个动态升降任务的实验数据.

主要成果:

  • 增强的脊柱模型在动态举重任务中准确预测脊柱力量.
  • 最大力和力模式与实验数据显示出强烈的相关性 (r > 0.9).
  • 外部负载建模方法并没有显著影响整体力预测的准确性.

结论:

  • 增强的OpenSim脊柱模型在动态任务中表现出高的生物忠实性.
  • 该模型是可访问和验证的,使其适合估计脊柱力.
  • 推用于基于多体的脊柱负荷在起重过程中的反向动态分析.